Molds & Tooling
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PA12 Shrinkage Range and Mold Compensation
Problem Phenomenon
【Problem phenomenon】PA12 products had large dimensional deviations, and shrinkage was inconsistent in areas with different wall thicknesses
Cause Analysis
PA12 shrinkage ranges widely from 0.5-2%, depending on the grade, wall thickness, and process conditions; the wide range makes uniform compensation fail, and dimensional design must be calculated according to actual conditions
Solution
Design mold compensation according to the grade data sheet and the measured shrinkage of wall thickness; modify the mold after measuring key dimensions of the first article; lock the process to reduce shrinkage fluctuation; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The wide 0.5-2% shrinkage range requires measured compensation, and empirical values are unreliable; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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